Percentage Change Calculator
Calculate percentage increase or decrease.
About the Percentage Change Calculator
Calculate percentage change free: (new − old) ÷ old × 100. Enter any two values — last month's revenue vs this month's, old price vs new, before vs after — and get the percent increase or decrease instantly. It also clears up the classic confusion between percentage change and percentage points: going from 10% to 12% is a 2-point rise but a 20% relative increase.
How to use the Percentage Change Calculator
- 1Enter your the original value and the new value.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How is percentage change calculated?
Percentage change = (new − old) ÷ |old| × 100. A positive result is an increase; negative is a decrease.
What's the difference between percentage change and percentage points?
Percentage change is relative; percentage points are an absolute difference between two percentages (e.g. 10% to 12% is +2 points, +20%).
Why is a 50% loss not fixed by a 50% gain?
Because the base changes: $100 − 50% = $50, and $50 + 50% = $75. After a 50% drop you need a 100% gain to get back to even.